[GHC] #9121: Presence of dyn_o files not checked upon recompilation

[GHC]

#9121: Presence of dyn_o files not checked upon recompilation
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        Reporter:  andreas.abel      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Driver            |              Version:  7.8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ghorn):

 This bug persists on GHC 8.0.1 at least, I run into it a few times a week
 using stack. Also see
 https://github.com/commercialhaskell/stack/issues/1842

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9121#comment:6>
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